Originally Posted by
Ravenoco
Aizen said this in the chapter we just read. Page 2 first panel to be exact.
" I have reached my limit. The Limit of my shinigami self. "
The royal guard is supposed to be the protectors of the King. I know if I was King I would have the most powerful people be my guards. More powerful then the Gotei 13. So in just the "thin air" i pulled a simple and most likely accurate statement out of coupled with the standing that most of us think Isshen is from them we determine that Aizen being at his limit is as a shinigami means that the limit of him has to be passed by isshen who is clearly not in bankai or shikai that we know off and has pushed aizen there. This makes the limit further possibly or at least maybe a way to increase the limit that Aizen is claiming to be at?